CN107223303B - Voltage conversion device and fingerprint detection system - Google Patents
Voltage conversion device and fingerprint detection system Download PDFInfo
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- CN107223303B CN107223303B CN201780000385.3A CN201780000385A CN107223303B CN 107223303 B CN107223303 B CN 107223303B CN 201780000385 A CN201780000385 A CN 201780000385A CN 107223303 B CN107223303 B CN 107223303B
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- sensor
- voltage
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The invention relates to voltage conversion devices and fingerprint detection system.The device includes that three input terminals, two capacitors and two output ends, two output ends are located at the both ends of one of capacitor, and at the first moment, which is in charged state, is two capacitor chargings；The second moment after first moment, the device are in the first discharge condition, and two capacitors are connected with input terminal power supply；Third moment after first moment, the device are in the second discharge condition, two capacitor series connection and one end ground connection.The voltage conversion device and fingerprint detection system of the embodiment of the present application, the floating ground of supply voltage is realized using a small amount of capacitor, the voltage conversion device can preferably be integrated into inside circuit or be encapsulated into chip, it can be used for promoting supply voltage for fingerprint chip, reduce the dependence to peripheral components while promoting entire fingerprint chip performance, promotes the reliability of whole system.
Description
Technical field
This application involves technical field of biometric identification more particularly to a kind of voltage conversion device and fingerprint detection systems.
Background technique
It is constantly promoted as cell phone manufacturer is placed on positive demand and reliability to fingerprint mould group, fingerprint chip needs to prop up
Hold higher and higher cover sheet thickness.Part cell phone manufacturer is in order to which mobile phone is beautiful and waterproof considers, it is desirable that fingerprint chip can be supported
Implicit fingerprint (UnderGlass).Due to the limitation of battery of mobile phone voltage, the supply voltage of fingerprint chip is generally in 2.8- at present
3.3V.And capacitance type fingerprint chip is made to be difficult to ensure performance under the voltage, effectively promoting stamp voltage becomes its performance
Key factor.
Capacitance type fingerprint chip generally realizes voltage increase using inductance type booster circuit, it is characterized in that passing through inductance
And modulation device, using the charge and discharge process of inductance, on the voltage for promoting fingerprint chip.But due to its use inductance as
Step-up device is not integrated into integrated circuit, while inductance is unfavorable for being encapsulated into inside chip due to the limitation of size, and
And if it will lead to the larger of integrated circuit using more capacitor.
Summary of the invention
This application provides a kind of voltage conversion device and fingerprint detection systems, can be realized the floating ground of supply voltage, are promoted
The semaphore of existing fingerprint chip, to promote the reliability of whole system.
In a first aspect, provide a kind of voltage conversion device, which includes: first input end, second defeated
Enter end, third input terminal, first capacitor, the second capacitor, the first output end and second output terminal, wherein the first input end connects
The first input power is connect, which connects the second input power, which connects third input power,
When the voltage conversion device is in charged state, the first end of the first capacitor is connected with the first input end,
The second end of the first capacitor is grounded, the first end of second capacitor respectively with second input terminal and the first output end phase
Even, the second end of second capacitor is connected with the second output terminal and ground respectively；
When the voltage conversion device is in the first discharge condition, the second end of the first capacitor and the third input terminal phase
Even, the first end of the first capacitor is connected with the second end of the second output terminal and second capacitor respectively, second capacitor
First end is connected with first output end；
When the voltage conversion device is in the second discharge condition, the first end of the first capacitor is grounded, the first capacitor
Second end be connected respectively with the first end of first output end and second capacitor, the second end of second capacitor and this second
Output end is connected, and the third moment is after first moment.
Optionally, which can be in charging moment at the first moment, be in first at the second moment and put
Electricity condition is in the second discharge condition at the third moment.Wherein, second moment and third moment, should after the first moment
The third moment can be before the second moment, which can also be after the second moment.
Therefore, the voltage conversion device of the embodiment of the present application realizes the floating ground of supply voltage using a small amount of capacitor, promotes fingerprint
Semaphore, while enabling the voltage conversion device to be preferably integrated into inside circuit or be encapsulated into chip and reducing externally
The dependence of peripheral device promotes the reliability of whole system.
With reference to first aspect, in a kind of implementation of first aspect, which further includes first group and opens
Pass, second group of switch and third group switch, for controlling the voltage conversion device in the charged state, the first discharge condition
It is switched over the second discharge condition.
With reference to first aspect and its above-mentioned implementation should when being only closed in another implementation of first aspect
When first group of switch, which is in the charged state, when being only closed second group of switch, the voltage converting means
It sets in first discharge condition.When being only closed third group switch, which is in second discharge condition.
With reference to first aspect and its above-mentioned implementation, in another implementation of first aspect, described first group
Switch, second group of switch and third group switch realize that eight switches are opened including first by eight switches
Pass, second switch, third switch, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 8th switch.
With reference to first aspect and its above-mentioned implementation, in another implementation of first aspect, the first capacitor
First end respectively with this eight switch in first switch, second switch and third switch one end be connected, the first switch
The other end be connected with first input power, the other end of second switch ground connection, the other end connection of the third switch
To the second output terminal, the second end of the first capacitor respectively with the 4th switch, the 5th switch and the in this eight switches
One end of six switches is connected, and the other end of the 4th switch is connected with the third input power, another termination of the 5th switch
The other end on ground, the 6th switch is connected to first output end, and the first end of second capacitor is opened with this eight respectively
One end of 7th switch in the Central Shanxi Plain is connected with the first output end, and the other end of the 7th switch is connected with second input power,
The second end of second capacitor is connected with one end of the 8th switch in second output terminal and this eight switches respectively, and the 8th opens
The other end of pass is grounded.
With reference to first aspect and its above-mentioned implementation, in another implementation of first aspect, this first group is opened
Closing includes the first switch, the 5th switch, the 7th switch and the 8th switch, which includes third switch
With the 4th switch, third group switch includes the second switch and the 6th switch.
With reference to first aspect and its above-mentioned implementation, in another implementation of first aspect, this eight switches
At least one of switch be metal-oxide semiconductor fieldeffect transistor.
With reference to first aspect and its above-mentioned implementation, in another implementation of first aspect, voltage conversion
Device further includes sequence controller, and the sequence controller is for controlling first group of switch, second group of switch and institute
State the switch state of third group switch.
With reference to first aspect and its above-mentioned implementation, in another implementation of first aspect, when the timing control
When device processed exports the first signal, which is in the first discharge condition, when the sequence controller exports second signal
When, which is in the second discharge condition.
Therefore, the voltage conversion device of the embodiment of the present application realizes the floating ground of supply voltage using a small amount of capacitor, so that the electricity
Pressure conversion equipment can preferably be integrated into inside circuit or be encapsulated into chip, can be used for being promoted for fingerprint chip and power
Voltage reduces the dependence to peripheral components, promotes the reliability of whole system while promoting entire fingerprint chip performance.
Second aspect provides a kind of fingerprint detection system, which includes fingerprint sensor and first aspect and
Voltage conversion device in each implementation of one side, wherein the voltage conversion device is connected to the fingerprint sensing
Device, for providing supply voltage for the fingerprint sensor.
In conjunction with second aspect, in a kind of implementation of second aspect, the fingerprint sensor includes probe power
End and sensor ground terminal, wherein the sensor feeder ear is connected to the first output end of the voltage conversion device, the biography
Sensor ground terminal is connected to the second output terminal of the voltage conversion device.
In conjunction with second aspect and its above-mentioned implementation, in another implementation of second aspect, the fingerprint is passed
Sensor further includes sensor circuit, operational amplifier and integrating capacitor, and the sensor circuit is for acquiring finger print information, and its
It is connected to the sensor ground terminal, and is switched by first sensor to the inverting input terminal for being connected to the operational amplifier,
The sensor feeder ear is connected to by second sensor switch simultaneously；The non-inverting input terminal of the operational amplifier is for connecing
Receive reference voltage；The integrating capacitor is connected between the output end of the operational amplifier and the inverting input terminal.
In conjunction with second aspect and its above-mentioned implementation, in another implementation of second aspect, the fingerprint detection
System further includes reset switch, and the reset switch is connected to the both ends of the integrating capacitor.
In conjunction with second aspect and its above-mentioned implementation, in another implementation of second aspect, when the voltage
When conversion equipment is in first discharge condition, the first sensor is closed the switch, and second sensor switch is disconnected
It opens；When the voltage conversion device is in second discharge condition, the first sensor switch is disconnected, and described second
Sensing switch closure.
The third aspect provides a kind of detection system, which includes sensor and voltage conversion circuit, the electricity
Voltage conversion circuit is connected to the sensor, for providing supply voltage for the sensor；The voltage conversion circuit includes
First capacitor and the second capacitor, wherein second capacitor both ends are connected respectively to the first output of the voltage conversion circuit
End and second output terminal；After charging complete, the both ends of the first capacitor have the voltage of the first input power, and described
The both ends of second capacitor have the voltage of the second input power；The first capacitor is for receiving third under the first discharge condition
The voltage increase of the second output terminal to first input power and the third are simultaneously inputted electricity by the voltage of input power
The voltage in source and, and by the negative electricity of the voltage pull-down of first output end to the first input power under the second discharge condition
Pressure；Second capacitor its both ends under first discharge condition and second discharge condition maintain the second input electricity
The voltage in source.
In conjunction with the third aspect, in a kind of implementation of the third aspect, the sensor include probe power end and
Sensor ground terminal, wherein the sensor feeder ear is connected to the first output end of the voltage conversion circuit, the sensor
Ground terminal is connected to the second output terminal of the voltage conversion circuit.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, the sensor
It further include sensor circuit, operational amplifier and integrating capacitor, the sensor circuit is for acquiring finger print information, and it is connected
It is switched to the inverting input terminal for being connected to the operational amplifier, simultaneously to the sensor ground terminal, and by first sensor
The sensor feeder ear is connected to by second sensor switch；The non-inverting input terminal of the operational amplifier is for receiving ginseng
Examine voltage；The integrating capacitor is connected between the output end of the operational amplifier and the inverting input terminal.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, when the voltage
When conversion circuit is in first discharge condition, the first sensor is closed the switch, and second sensor switch is disconnected
It opens；When the voltage conversion circuit is in second discharge condition, the first sensor switch is disconnected, and described second
Sensing switch closure.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, the voltage turns
Changing circuit includes first input end, the second input terminal and third input terminal, is separately connected first input power, described second
Input power and the third input power；When the voltage conversion circuit is in charged state, the of the first capacitor
One end is connected with the first input end, the second end ground connection of the first capacitor；The first end of second capacitor respectively with
Second input terminal is connected with first output end, the second end of second capacitor respectively with the second output terminal and
Ground is connected；When the voltage conversion circuit is in the first discharge condition, the second end of the first capacitor and the third are defeated
Entering end to be connected, the first end of the first capacitor is connected with the second end of the second output terminal and second capacitor respectively,
The first end of second capacitor is connected with first output end；The second discharge condition is in the voltage conversion circuit
When, the first end ground connection of the first capacitor, the second end of the first capacitor respectively with first output end and described the
The first end of two capacitors is connected, and the second end of second capacitor is connected with the second output terminal.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, the voltage turns
Changing circuit further includes first group of switch, second group of switch and third group switch, for controlling the voltage conversion circuit described
Charged state, the first discharge condition and the second discharge condition switch over.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, when being only closed institute
When stating first group of switch, the voltage conversion circuit is in the charged state；It is described when being only closed second group of switch
Voltage conversion circuit is in first discharge condition；When being only closed third group switch, at the voltage conversion circuit
In second discharge condition.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, described first group
Switch, second group of switch and third group switch realize that eight switches are opened including first by eight switches
Pass, second switch, third switch, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 8th switch.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, first electricity
The first end of appearance is connected with one end of the first switch, the second switch and the third switch respectively, and described first opens
The other end of pass is connected with first input power, and the other end ground connection of the second switch, the third switchs another
End is connected to the second output terminal；The second end of the first capacitor respectively with it is described 4th switch, it is described 5th switch and
One end of 6th switch is connected, and the other end of the 4th switch is connected with the third input power, and the described 5th opens
The other end of pass is grounded, and the other end of the 6th switch is connected to first output end；The first end of second capacitor
Be connected respectively with one end of the 7th switch and first output end, the described 7th other end switched and described second defeated
Enter power supply to be connected；The second end of second capacitor is connected with one end of the second output terminal and the 8th switch respectively,
The other end ground connection of 8th switch.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, described first group
Switch includes the first switch, the 5th switch, the 7th switch and the 8th switch；Second group of switch packet
Include the third switch and the 4th switch；The third group switch includes the second switch and the 6th switch.
In conjunction with the third aspect and its above-mentioned implementation, in another implementation of the third aspect, the voltage turns
Changing circuit further includes sequence controller, the sequence controller for control first group of switch, second group of switch and
The switch state of the third group switch；Wherein, when the sequence controller exports the first signal, the voltage conversion circuit
In the first discharge condition, when the sequence controller exports second signal, the voltage conversion circuit is in the second electric discharge
State.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the voltage conversion device of the embodiment of the present application.
Fig. 2 is the schematic diagram according to the fingerprint chip of the embodiment of the present application.
Fig. 3 is the schematic diagram according to the fingerprint detection system of the embodiment of the present application.
Specific embodiment
Below in conjunction with attached drawing, technical solutions in the embodiments of the present application is described.
Fig. 1 shows the schematic diagram of the voltage conversion device 100 according to the embodiment of the present application.Specifically, which converts
Device 100 may include: three input terminals, two capacitors and two output ends, wherein three input terminals are respectively the first input
End, the second input terminal and third input terminal, three input terminals are separately connected an input power, for example, as shown in Figure 1, the
One input terminal connects the first input power, i.e. analog power AVDD 1, and the second input terminal connects the second input power AVDD 2, the
Three input terminals connect third input power AVDD 3, and the voltage value of three input powers can be equal；Two capacitors are respectively
First capacitor C1 and the second capacitor C2 as shown in Figure 1；Two output ends are respectively the first output end and second as shown in Figure 1
Output end.
At the first moment, which is in charged state, and as first capacitor C1 and the second capacitor C2 fill
Electricity.Specifically, the first end of first capacitor C1 is connected with the first input power AVDD1 of first input end, the first capacitor
The second end of C1 is grounded GND；The first end of second capacitor C2 respectively with the second input power AVDD2 of the second input terminal and first
Output end is connected, and the second end of the second capacitor C2 is connected with second output terminal and ground GND respectively.
In the charged state, after first capacitor C1 charging, first end and second end have a voltage difference, which is equal to the
The voltage of one input power AVDD1；After second capacitor charging, the first end and second end of second capacitor C2 has voltage difference,
The voltage difference is equal to the voltage of the second input power AVDD2；Second output terminal is grounded GND, then output voltage is zero, the first output
Holding output voltage is the voltage of the second input power AVDD2.
At the second moment, which is in the first discharge condition, and specifically, which occurs
After first moment, i.e., after first capacitor C1 and the second capacitor C2 completes charging.In first discharge condition, first electricity
The second end for holding C1 is connected with the third input power AVDD3 of third input terminal, and the first end of first capacitor C1 is respectively with the
The second end of two output ends and the second capacitor C2 are connected, and the first end of the second capacitor C2 is connected with the first output end.
In first discharge condition, since first capacitor C1 and the second capacitor C2 has electricity by both ends after charging process
Pressure difference, then the voltage value of second output terminal is equal to the voltage value and first capacitor of the third input power AVDD3 of third input terminal
The sum of the voltage difference that C1 has, and the voltage difference at first capacitor both ends is equal to the voltage of the first input power AVDD1, therefore second
The sum of the voltage value of the voltage value of the output end voltage value equal to third input power AVDD3 and the first input power AVDD1.It is right
Ying Di, the voltage of the voltage value of the first output end equal to the first input power AVDD1, the second input power AVDD2 voltage and
The sum of the voltage of third input power AVDD3.When the first input power AVDD1, the second input power AVDD2 and third input electricity
When the voltage value of source AVDD3 is equal, such as be equal to V, then in the first discharge condition, the voltage of the first output end is equal to 3V, the
The voltage of two output ends is equal to 2V.
At the third moment, which is in the second discharge condition, specifically, the third moment occurs
After first moment, i.e., after first capacitor C1 and the second capacitor C2 completes charging.In second discharge condition, first capacitor
The first end of C1 is grounded GND, and the second end of first capacitor C1 is connected with the first end of the first output end and the second capacitor C2 respectively,
The second end of second capacitor C2 is connected with second output terminal.
Optionally, which can be after the second moment, can also be before second moment, and the application is implemented
Example is not limited to this.
In second discharge condition, since first capacitor C1 and the second capacitor C2 has electricity by both ends after charging process
Pressure difference, and the first end of first capacitor C1 is grounded GND, then and the voltage of the first output end is equal to the electricity of negative first capacitor C1
Pressure, and the voltage difference at the both ends first capacitor C1 is equal to the voltage of the first input power AVDD1, therefore, the voltage of the first output end
Equal to the voltage of the first negative input power AVDD；Accordingly, the voltage of second output terminal is equal to the first negative input power
The voltage of AVDD1 subtracts the voltage of the second input power AVDD2.As the first input power AVDD1 and the second input power AVDD2
Voltage value it is equal when, such as be equal to V, then in the second discharge condition, the voltage of the first output end is equal to-V, second output terminal
Voltage be equal to -2V.
Therefore, the voltage conversion device of the embodiment of the present application realizes that the floating ground of supply voltage, the voltage turn using a small amount of capacitor
Changing device can preferably be integrated into inside circuit or be encapsulated into chip, can be used for promoting power supply electricity for fingerprint chip
Pressure reduces the dependence to peripheral components, promotes the reliability of whole system while promoting entire fingerprint chip performance.
As one embodiment, which can also include three groups of switches, wherein first group of switch is used
It is in charged state in controlling the voltage conversion device 100, for example, making when first group in three groups of switches closes the switch
It obtains the voltage conversion device 100 and is in charged state；Second group of switch is put for controlling the voltage conversion device 100 in first
Electricity condition, for example, being put when second group in three groups of switches closes the switch so that the voltage conversion device 100 is in first
Electricity condition；Third group switch is in the second discharge condition for controlling the voltage conversion device 100, for example, working as three groups of switches
In third group when closing the switch so that the voltage conversion device 100 is in the second discharge condition.
In the embodiment of the present application, as shown in Figure 1, the voltage conversion device 100 can specifically include eight switches, below
It is denoted as first to the 8th 1~Ф of switch Ф 8 respectively；I.e. three groups of switches of the voltage conversion device 100 can be opened by this eight
It closes 1~Ф of Ф 8 to realize, to control the voltage conversion device 100 in charged state, the first discharge condition and the second discharge condition
Between converted.
Specifically, as shown in Figure 1, in the voltage conversion device 100, the first end of first capacitor C1 respectively with this eight
First switch Ф 1, second switch Ф 2 in switch are connected with one end of third switch Ф 3, the other end of first switch Ф 1
It is connected with the first input power AVDD 1 of first input end, the other end of second switch Ф 2 is grounded GND；First capacitor C1
Second end respectively in this eight switches the 4th switch Ф 4, the 5th switch Ф 5 and one end of the 6th switch Ф 6 be connected, this
The other end of 4th switch Ф 4 is connected with the third input power AVDD3 of third input terminal, the other end of the 5th switch Ф 5
It is grounded GND.
The first end of second capacitor C2 is defeated with the other end of the 6th switch Ф 6, one end of the 7th switch Ф 7 and first respectively
Outlet is connected, and the other end of the 7th switch Ф 7 is connected with the second input power AVDD2 phase；The second end of second capacitor C2 point
It is connected with one end of the 8th switch Ф 8 in second output terminal, the other end of third switch Ф 3 and this eight switches, this
The other end of eight switch Ф 8 is grounded GND.
It should be understood that as shown in Figure 1, first switch Ф 1, the 5th switch Ф 5, the 7th switch Ф 7 and the 8th switch Ф 8 belong to
First group of switch, i.e., only this four when closing the switch, which is in charged state；Third switch Ф 3 and
Four switch Ф 4 belong to second group of switch, i.e., when being only closed this two switches, which is in the first electric discharge shape
State；Second switch Ф 2 and the 6th switch Ф 6 belongs to third group switch, i.e., when being only closed this two switches, the voltage conversion device
100 are in the second discharge condition.
Optionally, which can control the state of each group switch by sequence controller.Specifically,
The voltage conversion device 100 may include sequence controller, when the sequence controller exports the first signal, the voltage converting means
100 are set in the first discharge condition；When the sequence controller exports second signal, which is in second
Discharge condition；When the sequence controller not output signal, or when output third signal, which is in
Charged state, the embodiment of the present application are not limited to this.
In the embodiment of the present application, which can be used for converting voltage, for example, can be used for will be electric
The output voltage obtained after pressure conversion is supplied to fingerprint chip as the supply voltage of fingerprint chip.Specifically, Fig. 2 shows
According to the schematic diagram of the fingerprint chip 200 of the embodiment of the present application.As shown in Fig. 2, the fingerprint chip 200 has fingerprint input terminal
With the 4th input terminal, which is used for typing finger print information, such as shown in Fig. 2, when acquiring user fingerprints, the user
Finger press the fingerprint chip so that finger is coupled with the fingerprint input terminal；4th input terminal can be converted with voltage
The first output end in device 100 is connected, i.e. the voltage value of the 4th input terminal is defeated equal to first in voltage conversion device 100
The voltage of outlet, alternatively, the 4th input terminal can also be connected with the internal electric source of other fingerprint chips, the embodiment of the present application is simultaneously
It is without being limited thereto.
Specifically, which further includes the 9th switch Ф 9, the tenth switch Ф 10, sensor circuit, integral electricity
Hold Cint and operational amplifier, wherein the sensor circuit may include the sensor array with multiple detecting electrodes, the inspection
Surveying electrode can be pixel (Pixel) electrode.The 9th switch Ф 9 and the tenth switch Ф 10 can also respectively become institute
State the first sensor switch and second sensor switch of fingerprint chip 200.When carrying out fingerprint recognition, such as shown in 2, the use
Finger is coupled to the fingerprint input terminal of the fingerprint chip 200 by family, and sensor circuit can acquire and handle the fingerprint of the user,
Can will be equivalent at fingerprint detection capacitor Cf between the detecting electrode in finger and sensor circuit, by detecting the fingerprint detection
The capacitor of capacitor Cf, and then obtain user fingerprints information.
Specifically, fingerprint detection capacitor Cf is connected with sensor circuit in fingerprint chip 200, which can be with
Second output terminal in voltage conversion device 100 is connected, i.e., the second output terminal in voltage conversion device 100 connects the sensor
Circuit reference ground so that the voltage value of the fingerprint chip 200 with the voltage of second output terminal as the reference voltage.The sensor
Circuit is also connected with one end of the 9th switch Ф 9 and the tenth switch Ф 10 respectively；The other end of 9th switch Ф 9 and the fingerprint core
4th input terminal of piece 200 is connected；The other end of tenth switch Ф 10 respectively with one end of integrating capacitor Cint, operational amplifier
Reverse input end be connected；The output end of the other end connection operational amplifier of integrating capacitor Cint；Operational amplifier it is in the same direction
Input terminal can connect a power supply unit, so that the noninverting input can receive reference voltage Vcm.In addition, the operation
The output end output voltage Vout of amplifier, can be detected by voltage detection module；Optionally, the fingerprint chip 200
It may include the voltage detection module, the output end output voltage Vout for detection calculations amplifier.
Optionally, the both ends of the integrating capacitor Cint in the fingerprint chip 200 can also connect reset switch Reset, should
Reset switch Reset is used to be closed reset switch Reset when not needing to carry out fingerprint detection, the fingerprint chip 200 not work
Make.
It is alternatively possible to control the 9th switch Ф 9 and the tenth switch Ф 10 of the fingerprint chip 200 by sequence controller
Switch state switching, for example, the fingerprint chip 200 may include that the sequence controller or the sequence controller can also be with
Included in the voltage conversion device 100.Specifically, when the sequence controller exports a kind of signal, the 9th switch Ф 9 is closed
It closes, the tenth switch Ф 10 is disconnected, and when the sequence controller exports another signal, the tenth switch Ф 10 closure, the 9th is opened
Ф 9 is closed to disconnect；When the sequence controller not output signal, the 9th switch Ф 9 and the tenth switch Ф 10 are disconnected.
In the embodiment of the present application, for the convenience of description, below with the first input power AVDD1, the second input power
The voltage value of AVDD2 and third input power AVDD3 are illustrated for being equal, and assume the voltage of three input powers
Value is V.I.e. in the first discharge condition, the voltage of the first output end is equal to 3V, and the voltage of second output terminal is equal to 2V；Second
Discharge condition, the voltage of the first output end are equal to-V, and the voltage of second output terminal is equal to -2V.
In the embodiment of the present application, as shown in Fig. 2, when reset switch Reset is in an off state, the fingerprint chip
200 start to execute finger scan.Specifically, 9 He of the 9th switch Ф can be controlled by the signal of the output of sequence controller
Tenth switch Ф 10 and above-mentioned three groups switch on-off state；When sequence controller exports low level, the 9th switch of control
The closure of Ф 9 and the tenth switch Ф 10 are disconnected, and voltage conversion device 100 is in the first discharge condition, while being controlled voltage and being turned
Second group in changing device 100 closes the switch, i.e., the voltage of the first output end of voltage conversion device 100 is equal to 3V at this time, the
The voltage of two output ends is equal to 2V.Correspondingly, the reference voltage of the sensor circuit of fingerprint chip 200 is 2V, and with fingerprint
For 4th input terminal of chip 200 is connected with the first output end in voltage conversion device 100, i.e., the 4th input terminal is defeated
Entering voltage is 3V, then charge sum Q=3V*Cf+ (Vcm-Vout1) the * Cint on Cf and Cint, wherein Cf indicates fingerprint inspection
The capacitance of capacitor is surveyed, Cint indicates the capacitance of integrating capacitor, and Vcm indicates to connect the confession of the operational amplifier noninverting input
The voltage of electric installation, Vout1 indicate the output voltage values that the voltage detection module of connection operational amplifier output terminal currently measures.
Similar, when sequence controller exports high level, the 9th switch Ф 9 of control is disconnected and the tenth switch Ф 10 is closed
It closes, and voltage conversion device 100 is in the second discharge condition, i.e. the voltage of the first output end of voltage conversion device 100 at this time
Equal to-V, the voltage of second output terminal is equal to -2V.Correspondingly, the reference voltage of the sensor circuit of fingerprint chip 200 be-
2V, the input voltage of the 4th input terminal are-V, then charge sum Q=(Vcm-2V) * Cf+ (Vcm-Vout2) * on Cf and Cint
Cint, wherein Vout2 indicates the voltage detection module of connection operational amplifier output terminal in the output voltage values currently measured.
For the varying level of sequence controller output, the charge sum of fingerprint detection capacitor and integrating capacitor is equal, then
Difference (Vout2-Vout1)=(Vcm-5V) * of an available timing control period 200 output voltage of fingerprint chip
Cf/Cint, the i.e. value of Cf can be come out by the voltage response that voltage detection module measures, and the peak of fingerprint and ridge can pass through
The difference of the value of Cf embodies, to export fingerprint form.
Optionally, after in sequence controller from output low level to output high level conversion, i.e. sequence controller output is high
It, can be with after the 9th switch Ф 9 of second group of switch and fingerprint chip 200 in off voltage conversion equipment 100 when level
First group of switch in first sealing voltage conversion equipment 100 completes the so that the voltage conversion device 100 is in charged state
The charging of one capacitor C1 and the second capacitor C2, then disconnect first group of switch and be closed third group switch, so that the voltage converting means
100 are set in the first discharge condition.Since the time that the voltage conversion device 100 is in charged state is shorter, can subtract
It is small or remove the stage.
Traditional fingerprint chip is generally on the basis of ground terminal GND, and in the embodiment of the present application, and fingerprint chip 200 is with voltage
On the basis of the second output terminal of conversion equipment 100.Specifically, the sensor circuit of traditional fingerprint chip is grounded GND, it is assumed that defeated
The voltage for entering power supply is V, then electricity when being in the first detecting state by sequence controller control fingerprint chip, on Cf and Cint
Lotus sum Q=V*Cf+ (Vcm-Vout1) * Cint；When being in the second detecting state by sequence controller control fingerprint chip,
Charge sum Q=Vcm*Cf+ (Vcm-Vout2) * Cint on Cf and Cint, then available traditional fingerprint chip exports electricity
The difference (Vout2-Vout1) of pressure=(Vcm-V) * Cf/Cint.
Traditional finger of voltage conversion is carried out accordingly, with respect to the voltage conversion device 100 without using the embodiment of the present application
Line chip, the embodiment of the present application can make voltage difference be increased to original (Vcm-5V)/(Vcm-V) times, under normal circumstances,
Vcm can be 0.5V, then semaphore increases 8 times.
Therefore, the device of the voltage conversion of the embodiment of the present application realizes the floating ground of supply voltage, the voltage using a small amount of capacitor
Conversion equipment, as boosting element, can preferably be integrated into inside circuit or be encapsulated into chip without inductance, can
To be used to promote supply voltage for fingerprint chip, reduce the dependence to peripheral components while promoting entire fingerprint chip performance,
Promote the reliability of whole system.
In the embodiment of the present application, which can preferably be integrated into inside circuit or be encapsulated into chip
In, it can it is integrated into fingerprint chip, therefore, Fig. 3 shows the signal of the fingerprint detection system according to the embodiment of the present application
Figure.
As shown in figure 3, the fingerprint detection system includes voltage conversion device and fingerprint sensor, wherein in dotted line frame
Voltage conversion device can correspond to the voltage conversion device 100 of the embodiment of the present application, i.e. eight in voltage conversion device 100 open
It closes, metal (metal)-oxide (oxide)-semiconductor (semiconductor) field effect transistor (metal-oxide-semiconductor) can be passed through
It realizes, if the Q1-Q8 in Fig. 3 is eight metal-oxide-semiconductors, which can make the device be in different conditions.In Fig. 3 system
Fingerprint sensor can fingerprint chip 200 in corresponding diagram 2.In Fig. 3, voltage turns in the end the SAVDD corresponding diagram 1 in dotted line frame
First output end of changing device 100, the second output terminal of voltage conversion device 100 in the end the SGND corresponding diagram 1 in dotted line frame.Institute
Stating fingerprint sensor includes sensor feeder ear and sensor ground terminal, and the sensor feeder ear and the sensor ground terminal can be with
Be connected respectively to the voltage conversion device 100 the first output end (i.e. the SAVDD of Fig. 3) and second output terminal (i.e. Fig. 3's
SGND)。
Specifically, when voltage conversion device needs work in charged state, even entire fingerprint detection system work exists
The S1 stage controls the first signal wire S1 by sequence controller and exports high level, and second signal line S2 and third signal wire S3 are defeated
Low level out, the first metal-oxide-semiconductor Q1, the 4th metal-oxide-semiconductor Q4, the 8th metal-oxide-semiconductor Q8, the 6th metal-oxide-semiconductor Q6 conducting, other metal-oxide-semiconductors are cut at this time
Only, first capacitor C1 and the second capacitor C2 capacitor charging and charge is stored, the probe power end of fingerprint sensor and sensor
Be connected to power supply line SAVDD, the SGND of ground terminal is connected directly with power supply line AVDD, GND of master control respectively, i.e.,
The end SAVDD output voltage is equal to the voltage value of AVDD, and the end SGND is grounded GND, at this time fingerprint sensor can by the end SAVDD and
The power supply of the end SGND.
When voltage conversion device needs work in the first discharge condition, even entire fingerprint detection system work is in S2 rank
Duan Shi controls second signal line S2 by sequence controller and exports high level, the first signal wire S1 and third signal wire S3 output
Low level, third metal-oxide-semiconductor Q3 is connected at this time, since the charge of first capacitor C1 cannot be mutated, will lead to first capacitor C1 and the
One end level of the source level connection of two metal-oxide-semiconductor Q2 becomes 2AVDD, and the second metal-oxide-semiconductor Q2 is connected automatically, other metal-oxide-semiconductors, which are in, closes
State makes SGND level become 2AVDD, and SAVDD level becomes 3AVDD, i.e., fingerprint sensor can pass through the end SAVDD at this time
The 3AVDD at the end 2AVDD and SGND powers.
When voltage conversion device needs work in the second discharge condition, even entire fingerprint detection system work is in S3 rank
Duan Shi controls third signal wire S3 by sequence controller and exports high level, the first signal wire S1 and second signal line S2 output
Low level, the 5th metal-oxide-semiconductor Q5 is connected at this time, since the charge of first capacitor C1 cannot be mutated, will lead to first capacitor C1 and the
One end level of the source level connection of seven metal-oxide-semiconductor Q7 becomes-AVDD, and the 7th metal-oxide-semiconductor Q7 is connected automatically, other metal-oxide-semiconductors, which are in, closes
State makes SAVDD level become-AVDD, and SGND level becomes -2AVDD, i.e., fingerprint sensor can pass through the end SAVDD at this time
- AVDD and the end SGND -2AVDD power supply.
Therefore, the fingerprint detection system of the embodiment of the present application, including voltage conversion device can use a small amount of capacitor and realize
The floating ground of supply voltage, which can preferably be integrated into inside circuit or be encapsulated into chip, in the fingerprint
In detection system, it can be used for promoting supply voltage for fingerprint sensor, subtract while promoting entire fingerprint detection system performance
The small dependence to peripheral components, promotes the reliability of whole system.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.
Claims (21)
1. a kind of voltage conversion device characterized by comprising first input end, the second input terminal, third input terminal, first
Capacitor, the second capacitor, the first output end and second output terminal, wherein the first input end connects the first input power, described
Second input terminal connects the second input power, and the third input terminal connects third input power,
Wherein, when the voltage conversion device is in charged state, the first end of the first capacitor and first input
End is connected, the second end ground connection of the first capacitor；The first end of second capacitor respectively with second input terminal and institute
It states the first output end to be connected, the second end of second capacitor is connected with the second output terminal and ground respectively；
When the voltage conversion device is in the first discharge condition, the second end of the first capacitor and the third input terminal
It is connected, the first end of the first capacitor is connected with the second end of the second output terminal and second capacitor respectively, described
The first end of second capacitor is connected with first output end；
When the voltage conversion device is in the second discharge condition, the first end of the first capacitor is grounded, first electricity
The second end of appearance is connected with the first end of first output end and second capacitor respectively, the second end of second capacitor
It is connected with the second output terminal；
The voltage conversion device further includes that first group of switch, second group of switch and third group switch,
When being only closed first group of switch, the voltage conversion device is in the charged state,
When being only closed second group of switch, the voltage conversion device is in first discharge condition,
When being only closed third group switch, the voltage conversion device is in second discharge condition.
2. voltage conversion device according to claim 1, which is characterized in that first group of switch, described second group open
Pass and third group switch realize that eight switches are opened including first switch, second switch, third by eight switches
Pass, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 8th switch.
3. according to right want 2 described in voltage conversion device, which is characterized in that the first end of the first capacitor respectively with it is described
First switch, the second switch are connected with one end that the third switchs, the other end of the first switch and described first
Input power is connected, and the other end ground connection of the second switch, the other end of the third switch is connected to second output
End；
One end phase that the second end of the first capacitor is switched with the 4th switch, the 5th switch and the described 6th respectively
Even, the other end of the 4th switch is connected with the third input power, and the described 5th other end switched is grounded, and described the
The other end of six switches is connected to first output end；
The first end of second capacitor is connected with one end of the 7th switch and first output end respectively, and the described 7th
The other end of switch is connected with second input power；
The second end of second capacitor is connected with one end of the second output terminal and the 8th switch respectively, and the described 8th
The other end of switch is grounded.
4. voltage conversion device according to claim 3, which is characterized in that first group of switch includes described first opening
It closes, the 5th switch, the 7th switch and the described 8th switch；Second group of switch includes the third switch and institute
State the 4th switch；The third group switch includes the second switch and the 6th switch.
5. voltage conversion device according to claim 2, which is characterized in that at least one of described eight switches switch
For metal-oxide semiconductor fieldeffect transistor.
6. voltage conversion device according to claim 1, which is characterized in that the voltage conversion device further includes timing control
Device processed, the sequence controller are used to control opening for first group of switch, second group of switch and third group switch
Off status.
7. voltage conversion device according to claim 6, which is characterized in that when the sequence controller exports the first signal
When, the voltage conversion device is in the first discharge condition,
When the sequence controller exports second signal, the voltage conversion device is in the second discharge condition.
8. a kind of fingerprint detection system, which is characterized in that including fingerprint sensor and as described in any one of claims 1 to 7
Voltage conversion device, wherein the voltage conversion device is connected to the fingerprint sensor, for being the fingerprint sensor
Supply voltage is provided.
9. fingerprint detection system according to claim 8, which is characterized in that the fingerprint sensor includes probe power
End and sensor ground terminal, wherein the sensor feeder ear is connected to the first output end of the voltage conversion device, the biography
Sensor ground terminal is connected to the second output terminal of the voltage conversion device.
10. fingerprint detection system according to claim 9, which is characterized in that the fingerprint sensor further includes sensor
Circuit, operational amplifier and integrating capacitor, the sensor circuit is for acquiring finger print information, and it is connected to the sensor
Ground terminal, and switched by first sensor to the inverting input terminal for being connected to the operational amplifier, while passing through the second sensing
Device switch is connected to the sensor feeder ear；The non-inverting input terminal of the operational amplifier is for receiving reference voltage；It is described
Integrating capacitor is connected between the output end of the operational amplifier and the inverting input terminal.
11. fingerprint detection system according to claim 10, which is characterized in that further include reset switch, the reset is opened
Close the both ends for being connected to the integrating capacitor.
12. fingerprint detection system according to claim 10, which is characterized in that when the voltage conversion device is in described
When the first discharge condition, the first sensor is closed the switch, and second sensor switch disconnects；When the voltage is converted
When device is in second discharge condition, the first sensor switch is disconnected, and the second sensor closes the switch.
13. a kind of detection system, which is characterized in that including sensor and voltage conversion circuit, the voltage conversion circuit connection
To the sensor, for providing supply voltage for the sensor；The voltage conversion circuit includes first capacitor and second
Capacitor, wherein second capacitor both ends are connected respectively to the first output end and second output terminal of the voltage conversion circuit；
After charging complete, the both ends of the first capacitor have the voltage of the first input power, and second capacitor
Both ends have the voltage of the second input power；
The first capacitor under the first discharge condition for receiving the voltage of third input power and by the second output terminal
Voltage increase to the voltage of first input power and the third input power and, and will under the second discharge condition
The voltage pull-down of first output end to the first input power negative voltage；Second capacitor is in first discharge condition
The voltage of second input power is maintained with its both ends under second discharge condition,
The voltage conversion circuit further includes first group of switch, second group of switch and third group switch, for controlling the voltage
Conversion circuit is switched in the charged state, the first discharge condition and the second discharge condition,
When being only closed first group of switch, the voltage conversion circuit is in the charged state；When being only closed described
When two groups of switches, the voltage conversion circuit is in first discharge condition；It is described when being only closed third group switch
Voltage conversion circuit is in second discharge condition.
14. detection system according to claim 13, which is characterized in that the sensor includes probe power end and biography
Sensor ground terminal, wherein the sensor feeder ear is connected to the first output end of the voltage conversion circuit, the sensor
End is connected to the second output terminal of the voltage conversion circuit.
15. detection system according to claim 14, which is characterized in that the sensor further includes sensor circuit, fortune
Amplifier and integrating capacitor are calculated, the sensor circuit is for acquiring finger print information, and it is connected to the sensor ground terminal, and
It is switched by first sensor to the inverting input terminal for being connected to the operational amplifier, while being switched and being connected by second sensor
It is connected to the sensor feeder ear；The non-inverting input terminal of the operational amplifier is for receiving reference voltage；The integrating capacitor
It is connected between the output end of the operational amplifier and the inverting input terminal.
16. detection system according to claim 15, which is characterized in that when the voltage conversion circuit is in described first
When discharge condition, the first sensor is closed the switch, and second sensor switch disconnects；When the voltage conversion circuit
When in second discharge condition, the first sensor switch is disconnected, and the second sensor closes the switch.
17. detection system according to claim 13, which is characterized in that the voltage conversion circuit includes the first input
End, the second input terminal and third input terminal, are separately connected first input power, second input power and the third
Input power；
When the voltage conversion circuit is in charged state, the first end of the first capacitor and the first input end phase
Even, the second end ground connection of the first capacitor；The first end of second capacitor respectively with second input terminal and described
One output end is connected, and the second end of second capacitor is connected with the second output terminal and ground respectively；
When the voltage conversion circuit is in the first discharge condition, the second end of the first capacitor and the third input terminal
It is connected, the first end of the first capacitor is connected with the second end of the second output terminal and second capacitor respectively, described
The first end of second capacitor is connected with first output end；
When the voltage conversion circuit is in the second discharge condition, the first end of the first capacitor is grounded, first electricity
The second end of appearance is connected with the first end of first output end and second capacitor respectively, the second end of second capacitor
It is connected with the second output terminal.
18. detection system according to claim 13, which is characterized in that first group of switch, second group of switch
It is realized with third group switch by eight switches, eight switches are opened including first switch, second switch, third
Pass, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 8th switch.
19. according to right want 18 described in detection system, which is characterized in that the first end of the first capacitor is respectively with described
One switch, the second switch are connected with one end that the third switchs, the other end of the first switch and described first defeated
Enter power supply to be connected, the other end of the other end ground connection of the second switch, the third switch is connected to the second output terminal；
One end phase that the second end of the first capacitor is switched with the 4th switch, the 5th switch and the described 6th respectively
Even, the other end of the 4th switch is connected with the third input power, and the described 5th other end switched is grounded, and described the
The other end of six switches is connected to first output end；
The first end of second capacitor is connected with one end of the 7th switch and first output end respectively, and the described 7th
The other end of switch is connected with second input power；
The second end of second capacitor is connected with one end of the second output terminal and the 8th switch respectively, and the described 8th
The other end of switch is grounded.
20. according to right want 19 described in detection system, which is characterized in that first group of switch include the first switch,
5th switch, the 7th switch and the 8th switch；Second group of switch includes third switch and described
4th switch；The third group switch includes the second switch and the 6th switch.
21. detection system according to claim 13, which is characterized in that the voltage conversion circuit further includes timing control
Device, the sequence controller are used to control the switch of first group of switch, second group of switch and third group switch
State；Wherein, when the sequence controller exports the first signal, the voltage conversion circuit is in the first discharge condition, when
When the sequence controller output second signal, the voltage conversion circuit is in the second discharge condition.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/083176 WO2018201432A1 (en) | 2017-05-05 | 2017-05-05 | Voltage conversion apparatus and fingerprint detection system |
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| CN107223303A CN107223303A (en) | 2017-09-29 |
| CN107223303B true CN107223303B (en) | 2018-12-14 |
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| CN201780000385.3A Active CN107223303B (en) | 2017-05-05 | 2017-05-05 | Voltage conversion device and fingerprint detection system |
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| WO (1) | WO2018201432A1 (en) |
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| EP3493096B1 (en) * | 2017-10-18 | 2020-11-11 | Shenzhen Goodix Technology Co., Ltd. | Fingerprint sensor and terminal device |
| CN109119014B (en) * | 2018-09-07 | 2021-11-12 | 京东方科技集团股份有限公司 | Voltage output circuit, temperature compensation circuit and display device |
| CN109496315B (en) * | 2018-10-26 | 2022-05-03 | 深圳市汇顶科技股份有限公司 | Fingerprint detection coding device, fingerprint detection system and electronic equipment |
| CN113196281A (en) | 2019-10-16 | 2021-07-30 | 京东方科技集团股份有限公司 | Fingerprint identification detection circuit and method and display device |
| CN113447697B (en) * | 2021-04-19 | 2022-11-08 | 深圳市爱协生科技有限公司 | Signal detection circuit, signal detection method, touch panel and display device |
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